FILE-In this Monday, Oct. 1, 2012, file photo, Facebook CEO Mark Zuckerberg, smiles for photographers at the Gorki residencewhile meeting with the Russian Prime Minister Dmitry Medvedev in Moscow. Facebook's third-quarter results released Tuesday, Oct. 23, 2012, inched past Wall Street's expectations, offering evidence that the company is making inroads in mobile advertising, a longtime concern among investors. (AP Photo/Alexander Zemlianichenko, pool)